Effect of Patient Navigation on Colonoscopy Completion Screening Rate for Colorectal Cancer.

The goal of this randomized controlled trial is to evaluate the effectiveness of patient navigation on colonoscopy completion rates in a population screened for colorectal cancer. The main question\[s\] it aims to answer are: Are colonoscopy completion rates in colorectal cancer screening increased in navigated (intervention arm) compared with non-navigated (control arm) participants? Is mental well-being, as measured by HADs and GHQ12 scores, better in the intervention arm compared with the control arm? Participants in the intervention arm will receive: * standard clinic instructions for the colonoscopy * phone calls from the patient navigator to discuss the purpose, preparation, and additional information regarding the colonoscopy procedure * a webpage QR code consist of information on visual image on colonoscopy preparation and procedures, layout and map guidance to navigate in the hospital * a direct line for phone calls to patient navigators for further guidance on overcoming barriers Participants in the control arm will only receive: * standard clinic instructions for the colonoscopy * one phone call from the patient navigator to discuss the colonoscopy procedure